/*******************************************************************************
 * Copyright 2011, 2012 Chris Banes.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *******************************************************************************/
package com.handmark.pulltorefresh.library;

import me.himi.love.R;
import android.annotation.TargetApi;
import android.content.Context;
import android.os.Build.VERSION;
import android.os.Build.VERSION_CODES;
import android.util.AttributeSet;
import android.view.View;
import android.widget.HorizontalScrollView;

public class PullToRefreshHorizontalScrollView extends PullToRefreshBase<HorizontalScrollView> {

    public PullToRefreshHorizontalScrollView(Context context) {
	super(context);
    }

    public PullToRefreshHorizontalScrollView(Context context, AttributeSet attrs) {
	super(context, attrs);
    }

    public PullToRefreshHorizontalScrollView(Context context, Mode mode) {
	super(context, mode);
    }

    public PullToRefreshHorizontalScrollView(Context context, Mode mode, AnimationStyle style) {
	super(context, mode, style);
    }

    @Override
    public final Orientation getPullToRefreshScrollDirection() {
	return Orientation.HORIZONTAL;
    }

    @Override
    protected HorizontalScrollView createRefreshableView(Context context, AttributeSet attrs) {
	HorizontalScrollView scrollView;

	if (VERSION.SDK_INT >= VERSION_CODES.GINGERBREAD) {
	    scrollView = new InternalHorizontalScrollViewSDK9(context, attrs);
	} else {
	    scrollView = new HorizontalScrollView(context, attrs);
	}

	scrollView.setId(R.id.scrollview);
	return scrollView;
    }

    @Override
    protected boolean isReadyForPullStart() {
	return mRefreshableView.getScrollX() == 0;
    }

    @Override
    protected boolean isReadyForPullEnd() {
	View scrollViewChild = mRefreshableView.getChildAt(0);
	if (null != scrollViewChild) {
	    return mRefreshableView.getScrollX() >= (scrollViewChild.getWidth() - getWidth());
	}
	return false;
    }

    @TargetApi(9)
    final class InternalHorizontalScrollViewSDK9 extends HorizontalScrollView {

	public InternalHorizontalScrollViewSDK9(Context context, AttributeSet attrs) {
	    super(context, attrs);
	}

	@Override
	protected boolean overScrollBy(int deltaX, int deltaY, int scrollX, int scrollY, int scrollRangeX, int scrollRangeY, int maxOverScrollX, int maxOverScrollY, boolean isTouchEvent) {

	    final boolean returnValue = super.overScrollBy(deltaX, deltaY, scrollX, scrollY, scrollRangeX, scrollRangeY, maxOverScrollX, maxOverScrollY, isTouchEvent);

	    // Does all of the hard work...
	    OverscrollHelper.overScrollBy(PullToRefreshHorizontalScrollView.this, deltaX, scrollX, deltaY, scrollY, getScrollRange(), isTouchEvent);

	    return returnValue;
	}

	/**
	 * Taken from the AOSP ScrollView source
	 */
	private int getScrollRange() {
	    int scrollRange = 0;
	    if (getChildCount() > 0) {
		View child = getChildAt(0);
		scrollRange = Math.max(0, child.getWidth() - (getWidth() - getPaddingLeft() - getPaddingRight()));
	    }
	    return scrollRange;
	}
    }
}
